Make default programs support opening webp files and the problem goes away. Until that happens users have every reason to convert files from a format that is a pain in the ass to open.

They do.

Photos in windows supports it. Preview on Mac OS/photos on iOS supports it. I assume anything android would support it as well. Plus every web browser supports it.

Photos in windows supports it

It does? Ive tried to use photos to open it before. Its impossible to associate the file with Photos intuitively. I am about to start directly editing my registry to see if i can do it there.

Looks like maybe only the photos app in Windows 11? My Windows 10 VM is pretty out of date but they could have updated it by now. But who knows with Microsoft.

According to wikipedia almost everyone jumped on board in about 2020.

en.wikipedia.org/wiki/WebP#Support

WebP - Wikipedia

But it took a while for it, and many people are probably running old software without the updates, so at this point the hate has cemented.
Web browsers may support it, but websites often do not (for upload).

Coincidentally Lemmy is where I’ve seen it used by far the most.

Probably 90% of the images that I’ve looked at have been webp.

This. No programs I routinely use images for support it.
Make default programs support JPEG XL and the problem goes away, too, all with less Google.
Naming a compression scheme “XL” seems like a bad choice.
I have no idea what you mean. Now if you’ll excuse me, I gotta be getting back to my job at Titanic Boat Repair.
Bad name choices abound among software creators. It’s almost a default behaviour, especially in smaller teams or single developer situations. Like the guy who made crap cleaner for for his own use; he’d later share it friends, by the time he released it to the public he was forced to rename it ccleaner, it is still going to this day as one of the most downloaded windows software. He could have just given it a decent name in the beginning - for free. There is also GIMP, whose name simply keeps it out of serious use, unless you already know it’s capabilities.
It’s the early 00s and they’ve just been recently freed from the shackles of 8.3 file names, they’re going ham on those file extensions.
Yes PLEASE, JXL is just way superior and it's got the benefit of already having JPEG in its name which should ease widespread adoption. I never liked webp and it can seriously get lost.
I highly doubt they use webp to further their ambitions in web-supperiority.